Stereoscopic apparatus.



' PATENT-ED APR. 26, 1904.

H. G. SNOOK.

I smnnoscorm APPARATUSL APPLICATION FILED 111KB 22, 1903.

a sums-3311M 1.

THE.

N0. 758,117. PATENTBD APR. 26, 1904.

H. G. SNOOK.

STEREOSGOPIO APPARATUS.

I v urmoumn FILED mun 22,1902. no menu. v I zsnnnTs-snnnra.

UNITED STATES V Patented April 26, 1904.

PATENT OFFICE.

STEREOSCOPIO APPARATUS.

SPECIFICATION forming part of Letters Patent No. 758,117, dated Apri126, 1904.

Application filed J 1111a 22, 1903.

To all whom, it may concern.-

Be it known that I, HOMER CLYDE SNooK, a citizen-of the United States, residing in Phila-- delphia, Pennsylvania, have invented certain Improvements in Stereoscopic Apparatus, of which the following is a specification.

My invention relates to the use of Roentgen rays in the production of stereoscopic images; and it consists of an apparatus for carrying out a modification of the method of cutting off from one image the rays that produce the opposits image described and claimed in a former application, filed December 4, 1902, Serial No. 133,838.

' In the apparatus forming the subject of my present invention I employ a set or series of non-permeable stops so arranged between a fluorescent screen and the sources of radiation that two sets of images are formed, which are viewed by a similar set or series of non-permeable stops, whereby each eye sees a set of -images formed by a single source of radiation, such images blending into a single continuous image and producing the desired stereoscopic effect.

My invention is fully shown in the accompanying drawings, in which Figure 1 is a diagrammatic plan view of one form of apparatus embodying my invention. Fig. 2 is a side elevation of the same, and Figs. 3 and 4 are views illustrating details of my invention. 1

Referring to the drawings, '1 and 2 represent a pair of Roentgen or X ray tubes suitably mounted upon a stand so as to be movable from and toward each other, the stand being also freely movable. For the purpose of moving the tubes I may mount the tubes upon suitable standards 3, arranged to slide in a track 4, and employ right and left handed screws 5 and 6, adapted to nuts 7, carried by the standards, such screws having a common operating member 8. The fluorescent screen is shown at 10, and this screen is preferably carried by a portable stand or table 11, so as to be readily movable from and toward the source of radiation. Between this screen and the source of radiation there is mounted a set of stops, (indicated at 12 and arranged gridlike adjacent to the fluorescent screen,) and be- Serial no. 162,594. (N model.)

tween this set of stops and the source of radiation the object to be viewed (indicated at 13) is placed. These stops are so arranged that the shadows formed-by one source of radiation that illustrated at 1, for instanceexactly cover the spaces illuminated by the other source of radiation or that illustrated at 2, and vice versa. There are thus formed two sets of images which are stereoscopic with respect to each other because of the angle be- 0 tween the two beams of radiation passing throughthe object and falling upon the fluorescent screen. These two images are necessarily viewed by means of a set of stops 14, disposedbetween the fluorescentscreen and the eyes and so arranged that each eye (represent-ed by the points 15 and 16) sees but one set 01 images from the sources of radiation, the left eye, for instance, seeing the images pro- .duced by the right-hand tube or source of ra- 7 diation, and vice versa. Pseudo-stereoscopic efiect is obtained byshifting the position of the eyes along the base-line parallel to the fluorescent screen. This action in connection with the true stereoscopic effect has the apparout result of causing the object to advance and :recede from the eyes of the observer. This condition or effect inusing the apparatus is particularly applicable for locating the position of foreign bodies in the human anatomy.

The stops 12 and 14 should be very numerous say. eighty to the inchso that to the eyes of. the observer the separate images. formed by theseparate sources of radiation blend into a single continuous image having 5 true stereoscopic value. These stops, may be i made of wire of anysuitable substance capable of resisting Roentgen radiation.

In Figs. 3 and 4 I have shown forms of stops very greatly exaggerated, those in Fig. .9 3 being triangular in shape, while those of Fig. 4 are diamond-shaped; Any form of dB". sirable cross-section maybe used, and in the form of screen shown in Fig. 1 the stops are represented by opaque lines drawn, etched,or 3 otherwise formed on a plain sheet of glass. These stops are mounted in suitable frames, E and these frames are arranged to be movable from and toward the fluorescent screen. For

this purpose the table or stand 11 on which application, two sources of radiation may be arranged within the same tube. This arrangement, however, in view of the fixed relation of the anticathodes, restricts the perspective and makes the stereoscopic angle small, the apparent depth of the image not being normal. If two tubes are used, they must be of the same vacuum to produce images of the same brilliancy, as otherwise the attention of the observerwill be fixed upon the more brilliant image and the stereo effect will be lost.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination in an X-ray stereoscopic apparatus, of two sources of'radiation, a fluorescent screen,and a series of stops interposed between said screen and the source of radiation.

2. The combination in an X-ray stereoscopic apparatus, of two sources of radiation adjustable from and toward each other, a fluorescent screen, and a series of stops interposed between said screen and the source of radiation.

' 3. The combination in an X-ray stereoscopic apparatus, of two sources of radiation, a fluorescent screen and a screen of alternate transparent portions and portions impenetrable to the X-ray interposed between the source of radiation and the fluorescent screen and so adjusted as to give a stereoscopic effect by the parallax of binocular vision.

4. The combination in an X-ray stereoscopic apparatus, of two sources of radiation, a fluorescent screen and a series of stops interposed between such screen and the source of radiation, such stops being so arranged as to cut off from each image the rays which produce the opposite image.

5. The combination in an X-ray stereoscopic apparatus, of two sources of radiation, a fluorescent screen, and a screen formed of a series of wires of a substance impenetrable to the X-ray disposed so as to provide spaces of equal width between the same, such screen being interposed between the fluorescent screen and the source of radiation.

6. The combination in an X-ray stereoscopic apparatus, of two sources of radiation,

a fluorescent screen, a series of stops disposed between said screen and the source of radiation, said stops serving to divide the images into a series of parallel lines, and means for viewing such images as they are displayed upon the fluorescent screen.

7. The combination in an X-ray stereoscopic apparatus, of two sources of ra iation mounted so as to be movable toward and from each other, a portable stand or table for said sources of radiation, a fluorescent screen, a portable stand or table for the same, anadjustable screen comprising a series of stops carried by said table and interposed between the source of radiation and the fluorescent screen, and an adjustable viewing-screen comprising a series of stops also carried by said latter table.

8. The combination in an X-ray stereoscopic apparatus, of two sources of radiation comprising X-ray tubes, a mounting for said tubes whereby they may be moved toward and from each other simultaneously, a fluorescent screen, a series of stops interposed between said screen and the source of radiation, and a series ofstops disposed between said screen and the point of vision so adjusted as to give a stereoscopic effect by the parallax of binocular vision.

9. The combination in an X-ray stereoscopic apparatus, of two X-ray tubes mounted so as to be adjustable from and toward'each other, a fluorescent screen, a series of stops interposed between said screen and the source of radiation, means for adjusting said stops between these points, and an adjustable mounting for the fluorescent screen.

10. The combination in an X-ray stereoscopic apparatus, of two sources of radiation adjustable from and toward each other, a fluorescent screen adjustable from and toward the source of radiation, a series of stops interposed between the source of radiation and said screen and adjustable between the same, and a series of viewing-stops disposed beyond the screen and between the latter and the point of vision, said viewing-stops being adjustable from and toward the screen relatively to the adjustment of the stops interposed between the screen and the source of radiation, and serving to give a stereoscopic effect by the parallax of binocular vision.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

HOMER GLYDE SNOOK. 

